You've no uncertainty already experienced a 404 "page not discovered" blunder message when endeavoring to visit a specific page of a site. At whatever point the 404 or Not Found mistake message is shown on a page, the server ought to likewise restore a HTTP 404 standard reaction code. The 404 HTTP reaction code demonstrates that a site's server couldn't discover the page (URL) that was asked for by the client, which advises the two programs and web search tools that the page doesn't exist. Accordingly, the substance of the page (assuming any) won't be slithered or ordered via web indexes.

Overall, 404 have errors are not detrimental to SEO if their proportion is reasonable.

However, there are 3 troublesome cases :

if one of the important pages of your site returns by mistake a 404 code (for example following a technical error), this point must be urgently fixed because not only Google thinks this page has disappeared, but the visitors who want to access the page are also frustrated.
If an interesting external website has created a backlink towards an URL of your site by using a wrong URL. In this case, we advise you to contact the webmaster and report the error. This is a good opportunity to recover an interesting backlink, good for search engine optimization.
you havetoo many 404 errors on your site : the user experience and the analytical work of search engines could be hampered, which could ultimately have a negative impact on the SEO of your website.

- 404 have errors are not detrimental to SEO if their proportion is reasonable.

However, there are 3 troublesome cases :

if one of the important pages of your site returns by mistake a 404 code (for example following a technical error), this point must be urgently fixed because not only Google thinks this page has disappeared, but the visitors who want to access the page are also frustrated.
If an interesting external website has created a backlink towards an URL of your site by using a wrong URL. In this case, we advise you to contact the webmaster and report the error. This is a good opportunity to recover an interesting backlink, good for search engine optimization.
you havetoo many 404 errors on your site : the user experience and the analytical work of search engines could be hampered, which could ultimately have a negative impact on the SEO of your website.
Usually, as far as the search engine optimization is concerned, Google gives priority to quality websites that provide useful content and are accessible to Internet users and search engines. And to meet this level of quality requirements related to SEO, it's a good practice to regularly correct 404 errors.

It is therefore necessary to detect and correct 404 errors in order to:

facilitate the exploration (crawling) of your website by the search engines which will return more often.
improve user experience
give a better image of your website.
attract the audience
make sure you do not lose an interesting backlink because of a simple typo on the link placed on the external site

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